My ACF bit my cats tail, she no longer goes on top of the tank lol
I've just got a regular aquarium hood and keep the water level down a few inches from to top to prevent escapy
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LOL
How about plywood cut to fit? I know there are water resistant types like marine plywood and concrete plywood (i think?!).. holes can be easily drilled plus your cat can sleep on top of your tank the whole day. Just pray to God she doesn't pee on it lol.